H3C S7500E Series Operation Manual page 366

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches
R(Reserved): Set to 0.
PDU Type: For detail information, refer to
Version: Set to 1(0x01).
Maximum Area Address: Maximum number of area addresses supported.
Table 4-1 PDU type
Type
15
16
17
18
20
24
25
26
27
III. Hello
The hello packet is used by routers to establish and maintain the neighbor relationship.
It is also called IS-to-IS hello PDU (IIH). For broadcast network, the Level-1 router uses
the Level-1 LAN IIH; and the Level-2 router uses the Level-2 LAN IIH. The P2P IIH is
used on point-to-point network.
Figure 4-7
fields are the common header.
Level-1 LAN IS-IS hello PDU
Level-2 LAN IS-IS hello PDU
Point-to-Point IS-IS hello PDU
Level-1 Link State PDU
Level-2 Link State PDU
Level-1 Complete Sequence Numbers PDU
Level-2 Complete Sequence Numbers PDU
Level-1 Partial Sequence Numbers PDU
Level-2 Partial Sequence Numbers PDU
illustrates the hello packet format in broadcast networks, where the blue
Table 4-1.
PDU Type
4-9
Chapter 4 IS-IS Configuration
Acronym
L1 LAN IIH
L2 LAN IIH
P2P IIH
L1 LSP
L2 LSP
L1 CSNP
L2 CSNP
L1 PSNP
L2 PSNP